[Users] No checkpointing support

[Matt]

Tried to backup up a busy Centos 6.x 64 bit container with vzdump and
ran into this.  The host is fresh install of openvz on Centos 6.x as
well.

Linux 2.6.32-042stab084.20 #1 SMP Mon Jan 27 00:40:08 MSK 2014 x86_64
x86_64 x86_64 GNU/Linux

vzdump --compress --suspend 103

Mar 05 22:53:55 INFO: Starting Backup of VM 103 (openvz)
Mar 05 22:53:55 INFO: CTID 103 exist mounted running
Mar 05 22:53:55 INFO: status = CTID 103 exist mounted running
Mar 05 22:53:55 INFO: backup mode: suspend
Mar 05 22:53:55 INFO: bandwidth limit: 10240 KB/s
Mar 05 22:53:55 INFO: starting first sync /vz/private/103/ to
/vz/dump/vzdump-openvz-103-2014_03_05-22_53_55.tmp
Mar 05 23:20:18 INFO: file has vanished: "****"
Mar 05 23:20:18 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 00:10:05 INFO: file has vanished: "****"
Mar 06 02:09:02 INFO: Number of files: 1015371
Mar 06 02:09:02 INFO: Number of files transferred: 971380
Mar 06 02:09:02 INFO: Total file size: 93251854671 bytes
Mar 06 02:09:02 INFO: Total transferred file size: 93214323891 bytes
Mar 06 02:09:02 INFO: Literal data: 93214135989 bytes
Mar 06 02:09:02 INFO: Matched data: 0 bytes
Mar 06 02:09:02 INFO: File list size: 49445265
Mar 06 02:09:02 INFO: File list generation time: 0.001 seconds
Mar 06 02:09:02 INFO: File list transfer time: 0.000 seconds
Mar 06 02:09:02 INFO: Total bytes sent: 93315574018
Mar 06 02:09:02 INFO: Total bytes received: 18777388
Mar 06 02:09:02 INFO: sent 93315574018 bytes received 18777388 bytes
7972184.62 bytes/sec
Mar 06 02:09:02 INFO: total size is 93251854671 speedup is 1.00
Mar 06 02:09:02 INFO: rsync warning: some files vanished before they
could be transferred (code 24) at main.c(1039) [sender=3.0.6]
Mar 06 02:09:02 INFO: first sync finished (11707 seconds)
Mar 06 02:09:02 INFO: suspend vm
Mar 06 02:09:02 INFO: Setting up checkpoint...
Mar 06 02:09:02 INFO: Error: No checkpointing support, unable to open
/proc/cpt: No such file or directory
Mar 06 02:10:50 ERROR: Backup of VM 103 failed - command 'vzctl
--skiplock chkpnt 103 --suspend' failed with exit code 16